CL-ERR means clone error. Basically the radio has amnesia and there is no programming information. You will need to clone it from another working radio or get the software and a computer to radio cable and reprogram it.

You need software KPG-120D to program it and cable KPG-22 to connect the radio to the computer. Might be best to take it to a Kenwood dealer or shop and pay a few bucks to have it done. If you are so inclined the cable can be found on Ebay for under $10.00. Google KPG-120D and you can find sources t...

I think it is 5 watts, http://www.google.com/url?sa=t&rct=j&q=tk-8180%20low%20power&source=web&cd=4&cad=rja&ved=0CD4QFjAD&url=http%3A%2F%2Ffiles.radioscanner.ru%2Ffiles%2Fdownload%2Ffile3224%2Fkenwood_tk-2180_function_reference_.pdf&ei=4tq4UIGlKuX1iQKeq4D4Bg&usg=AFQjCNFPOmVio0OtwF1vhemrKhx8Lm8mJg Lo...

The radio should just read, no special mode to put it into. You mentioned OPC-1122, thats the serial verison. If that is correct are you using a USB serial adapter? This sort of looks like a computer issue or cable. Do you have access to a different computer? Also make sure the comm port you selecte...

I once considered doing the same thing with a pair of 730's in different band splits. In the software there is no option to program such a beast. It would be interesting to put together and try it. I'm thinking you could use an EEPROM programmer to program the EEPROMS. Be a lot of fiddling around.